辣椒素的提取和鉴定

辣椒素是辣椒果实中的主要辣味成分,在现实生活中有多种用途.为了提高辣椒素的提取效率,对辣椒素提取条件进行了优化研究.结果表明,提取的较适工艺是浸取溶剂为75%乙醇,浸取温度45℃,液固比10:1,浸取时间4h,提取级数为二级,在此条件下辣椒素的提取率为3.98‰.HPLC对比分析显示分离纯化效果较好.     

Influence of Surface Topography on the Tactile Friction of Medical Compression Textiles against a Mechanical Skin Model

Influence of surface topography on the tactile friction of medical compression textiles was studied in this paper. The friction behavior was investigated for three kinds of medical textiles with various structures and compositions by using a textile friction analyzer under dry condition. In order to simulate the contacts of textiles/human finger, a mechanical skin model with similar texture to the skin and applied normal load oflN were selected. Meanwhile, the 3D surface topography of textiles was measured using a digital microscope. The topographical data were analyzed concerning height distribution and material ratio, and the real contact area was estimated as a function of penetration depth. Results showed that the investigated textiles revealed a significant variation on the friction coefficients, which were （ 0.41 ± 0.01 ） （ polyamide, jersey 2 × 2 ）, （0.56 ± 0. 01） （cotton, jersey 2×2） and （0. 47 ± 0. 01） （polyamide, jersey 1 × 1 ）, respectively. The textile with higher friction coefficient was found to own a relative compact and homogenous surface and larger contact area, vice versa.     

MATLAB在经编织物几何特性探讨中的应用

本文主要介绍了经编织物的线圈几何结构及其应用性;用HATLAB语言模拟出真实的线圈及组织结构;分析编链组织,建立起相应的模型,实现在模拟出的织物上进行仿真,并与实际结构进行比较.     

基于频谱分析的织物粗糙感

传统研究一般通过测试织物表面的几何粗糙度和摩擦性能来预测粗糙感,而认知科学家发现,栅栏粗糙性的辨别取决于表面纹理波动曲线的谐波成分及纹理间距.为深入揭示织物粗糙感的形成机制,基于织物的表面形貌曲线,计算平均粗糙度,统计不同波动高度下的纹理间距,并采用傅里叶方法提取频域内谐波特征,比较分析这些特征值与粗糙感之间的关系.研究表明,织物的粗糙感差异取决于表面波动曲线频域内谐波的最高峰高度,而粗糙感不仅与平均粗糙度有关,也与表面纹理间距有关.     

羊毛衫织物袖口及下摆的组织结构探讨

随着针织产品应用领域的不断扩展,其主要纺织品羊毛衫的使用也越来越广泛.羊毛衫的设计就是根据市场需求和羊毛衫的特点,设计出满足不同要求,具有各种特性和具有高附加值的羊毛衫产品,从而丰富人们的服饰生活,满足各种人群的需要,开拓羊毛衫市场.羊毛衫的袖口和下摆是羊毛衫的组成部分,是羊毛衫优良性能和风格的体现,其组织具有多样化,它可以选用多种组织,如原组织、变化组织和花色组织均可;如单面的纬平针组织、双面的罗纹组织和双反面组织、提花,移圈、集圈、毛圈和长毛绒等组织,它能赋予羊毛衫显著花色效应和不同的物理机械性能,显示出羊毛衫的风格.